clone: fix up delay cloning conditions
[git] / builtin / clone.c
1 /*
2  * Builtin "git clone"
3  *
4  * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
5  *               2008 Daniel Barkalow <barkalow@iabervon.org>
6  * Based on git-commit.sh by Junio C Hamano and Linus Torvalds
7  *
8  * Clone a repository into a different directory that does not yet exist.
9  */
10
11 #include "builtin.h"
12 #include "parse-options.h"
13 #include "fetch-pack.h"
14 #include "refs.h"
15 #include "tree.h"
16 #include "tree-walk.h"
17 #include "unpack-trees.h"
18 #include "transport.h"
19 #include "strbuf.h"
20 #include "dir.h"
21 #include "pack-refs.h"
22 #include "sigchain.h"
23 #include "branch.h"
24 #include "remote.h"
25 #include "run-command.h"
26
27 /*
28  * Overall FIXMEs:
29  *  - respect DB_ENVIRONMENT for .git/objects.
30  *
31  * Implementation notes:
32  *  - dropping use-separate-remote and no-separate-remote compatibility
33  *
34  */
35 static const char * const builtin_clone_usage[] = {
36         "git clone [options] [--] <repo> [<dir>]",
37         NULL
38 };
39
40 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
41 static int option_local, option_no_hardlinks, option_shared, option_recursive;
42 static char *option_template, *option_depth;
43 static char *option_origin = NULL;
44 static char *option_branch = NULL;
45 static const char *real_git_dir;
46 static char *option_upload_pack = "git-upload-pack";
47 static int option_verbosity;
48 static int option_progress;
49 static struct string_list option_config;
50 static struct string_list option_reference;
51
52 static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
53 {
54         struct string_list *option_reference = opt->value;
55         if (!arg)
56                 return -1;
57         string_list_append(option_reference, arg);
58         return 0;
59 }
60
61 static struct option builtin_clone_options[] = {
62         OPT__VERBOSITY(&option_verbosity),
63         OPT_BOOLEAN(0, "progress", &option_progress,
64                         "force progress reporting"),
65         OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
66                     "don't create a checkout"),
67         OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
68         { OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
69                 "create a bare repository",
70                 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
71         OPT_BOOLEAN(0, "mirror", &option_mirror,
72                     "create a mirror repository (implies bare)"),
73         OPT_BOOLEAN('l', "local", &option_local,
74                     "to clone from a local repository"),
75         OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
76                     "don't use local hardlinks, always copy"),
77         OPT_BOOLEAN('s', "shared", &option_shared,
78                     "setup as shared repository"),
79         OPT_BOOLEAN(0, "recursive", &option_recursive,
80                     "initialize submodules in the clone"),
81         OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
82                     "initialize submodules in the clone"),
83         OPT_STRING(0, "template", &option_template, "template-directory",
84                    "directory from which templates will be used"),
85         OPT_CALLBACK(0 , "reference", &option_reference, "repo",
86                      "reference repository", &opt_parse_reference),
87         OPT_STRING('o', "origin", &option_origin, "name",
88                    "use <name> instead of 'origin' to track upstream"),
89         OPT_STRING('b', "branch", &option_branch, "branch",
90                    "checkout <branch> instead of the remote's HEAD"),
91         OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
92                    "path to git-upload-pack on the remote"),
93         OPT_STRING(0, "depth", &option_depth, "depth",
94                     "create a shallow clone of that depth"),
95         OPT_BOOL(0, "single-branch", &option_single_branch,
96                     "clone only one branch, HEAD or --branch"),
97         OPT_STRING(0, "separate-git-dir", &real_git_dir, "gitdir",
98                    "separate git dir from working tree"),
99         OPT_STRING_LIST('c', "config", &option_config, "key=value",
100                         "set config inside the new repository"),
101         OPT_END()
102 };
103
104 static const char *argv_submodule[] = {
105         "submodule", "update", "--init", "--recursive", NULL
106 };
107
108 static char *get_repo_path(const char *repo, int *is_bundle)
109 {
110         static char *suffix[] = { "/.git", ".git", "" };
111         static char *bundle_suffix[] = { ".bundle", "" };
112         struct stat st;
113         int i;
114
115         for (i = 0; i < ARRAY_SIZE(suffix); i++) {
116                 const char *path;
117                 path = mkpath("%s%s", repo, suffix[i]);
118                 if (stat(path, &st))
119                         continue;
120                 if (S_ISDIR(st.st_mode)) {
121                         *is_bundle = 0;
122                         return xstrdup(absolute_path(path));
123                 } else if (S_ISREG(st.st_mode) && st.st_size > 8) {
124                         /* Is it a "gitfile"? */
125                         char signature[8];
126                         int len, fd = open(path, O_RDONLY);
127                         if (fd < 0)
128                                 continue;
129                         len = read_in_full(fd, signature, 8);
130                         close(fd);
131                         if (len != 8 || strncmp(signature, "gitdir: ", 8))
132                                 continue;
133                         path = read_gitfile(path);
134                         if (path) {
135                                 *is_bundle = 0;
136                                 return xstrdup(absolute_path(path));
137                         }
138                 }
139         }
140
141         for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
142                 const char *path;
143                 path = mkpath("%s%s", repo, bundle_suffix[i]);
144                 if (!stat(path, &st) && S_ISREG(st.st_mode)) {
145                         *is_bundle = 1;
146                         return xstrdup(absolute_path(path));
147                 }
148         }
149
150         return NULL;
151 }
152
153 static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
154 {
155         const char *end = repo + strlen(repo), *start;
156         char *dir;
157
158         /*
159          * Strip trailing spaces, slashes and /.git
160          */
161         while (repo < end && (is_dir_sep(end[-1]) || isspace(end[-1])))
162                 end--;
163         if (end - repo > 5 && is_dir_sep(end[-5]) &&
164             !strncmp(end - 4, ".git", 4)) {
165                 end -= 5;
166                 while (repo < end && is_dir_sep(end[-1]))
167                         end--;
168         }
169
170         /*
171          * Find last component, but be prepared that repo could have
172          * the form  "remote.example.com:foo.git", i.e. no slash
173          * in the directory part.
174          */
175         start = end;
176         while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
177                 start--;
178
179         /*
180          * Strip .{bundle,git}.
181          */
182         if (is_bundle) {
183                 if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
184                         end -= 7;
185         } else {
186                 if (end - start > 4 && !strncmp(end - 4, ".git", 4))
187                         end -= 4;
188         }
189
190         if (is_bare) {
191                 struct strbuf result = STRBUF_INIT;
192                 strbuf_addf(&result, "%.*s.git", (int)(end - start), start);
193                 dir = strbuf_detach(&result, NULL);
194         } else
195                 dir = xstrndup(start, end - start);
196         /*
197          * Replace sequences of 'control' characters and whitespace
198          * with one ascii space, remove leading and trailing spaces.
199          */
200         if (*dir) {
201                 char *out = dir;
202                 int prev_space = 1 /* strip leading whitespace */;
203                 for (end = dir; *end; ++end) {
204                         char ch = *end;
205                         if ((unsigned char)ch < '\x20')
206                                 ch = '\x20';
207                         if (isspace(ch)) {
208                                 if (prev_space)
209                                         continue;
210                                 prev_space = 1;
211                         } else
212                                 prev_space = 0;
213                         *out++ = ch;
214                 }
215                 *out = '\0';
216                 if (out > dir && prev_space)
217                         out[-1] = '\0';
218         }
219         return dir;
220 }
221
222 static void strip_trailing_slashes(char *dir)
223 {
224         char *end = dir + strlen(dir);
225
226         while (dir < end - 1 && is_dir_sep(end[-1]))
227                 end--;
228         *end = '\0';
229 }
230
231 static int add_one_reference(struct string_list_item *item, void *cb_data)
232 {
233         char *ref_git;
234         struct strbuf alternate = STRBUF_INIT;
235         struct remote *remote;
236         struct transport *transport;
237         const struct ref *extra;
238
239         /* Beware: real_path() and mkpath() return static buffer */
240         ref_git = xstrdup(real_path(item->string));
241         if (is_directory(mkpath("%s/.git/objects", ref_git))) {
242                 char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git));
243                 free(ref_git);
244                 ref_git = ref_git_git;
245         } else if (!is_directory(mkpath("%s/objects", ref_git)))
246                 die(_("reference repository '%s' is not a local directory."),
247                     item->string);
248
249         strbuf_addf(&alternate, "%s/objects", ref_git);
250         add_to_alternates_file(alternate.buf);
251         strbuf_release(&alternate);
252
253         remote = remote_get(ref_git);
254         transport = transport_get(remote, ref_git);
255         for (extra = transport_get_remote_refs(transport); extra;
256              extra = extra->next)
257                 add_extra_ref(extra->name, extra->old_sha1, 0);
258
259         transport_disconnect(transport);
260         free(ref_git);
261         return 0;
262 }
263
264 static void setup_reference(void)
265 {
266         for_each_string_list(&option_reference, add_one_reference, NULL);
267 }
268
269 static void copy_alternates(struct strbuf *src, struct strbuf *dst,
270                             const char *src_repo)
271 {
272         /*
273          * Read from the source objects/info/alternates file
274          * and copy the entries to corresponding file in the
275          * destination repository with add_to_alternates_file().
276          * Both src and dst have "$path/objects/info/alternates".
277          *
278          * Instead of copying bit-for-bit from the original,
279          * we need to append to existing one so that the already
280          * created entry via "clone -s" is not lost, and also
281          * to turn entries with paths relative to the original
282          * absolute, so that they can be used in the new repository.
283          */
284         FILE *in = fopen(src->buf, "r");
285         struct strbuf line = STRBUF_INIT;
286
287         while (strbuf_getline(&line, in, '\n') != EOF) {
288                 char *abs_path, abs_buf[PATH_MAX];
289                 if (!line.len || line.buf[0] == '#')
290                         continue;
291                 if (is_absolute_path(line.buf)) {
292                         add_to_alternates_file(line.buf);
293                         continue;
294                 }
295                 abs_path = mkpath("%s/objects/%s", src_repo, line.buf);
296                 normalize_path_copy(abs_buf, abs_path);
297                 add_to_alternates_file(abs_buf);
298         }
299         strbuf_release(&line);
300         fclose(in);
301 }
302
303 static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
304                                    const char *src_repo, int src_baselen)
305 {
306         struct dirent *de;
307         struct stat buf;
308         int src_len, dest_len;
309         DIR *dir;
310
311         dir = opendir(src->buf);
312         if (!dir)
313                 die_errno(_("failed to open '%s'"), src->buf);
314
315         if (mkdir(dest->buf, 0777)) {
316                 if (errno != EEXIST)
317                         die_errno(_("failed to create directory '%s'"), dest->buf);
318                 else if (stat(dest->buf, &buf))
319                         die_errno(_("failed to stat '%s'"), dest->buf);
320                 else if (!S_ISDIR(buf.st_mode))
321                         die(_("%s exists and is not a directory"), dest->buf);
322         }
323
324         strbuf_addch(src, '/');
325         src_len = src->len;
326         strbuf_addch(dest, '/');
327         dest_len = dest->len;
328
329         while ((de = readdir(dir)) != NULL) {
330                 strbuf_setlen(src, src_len);
331                 strbuf_addstr(src, de->d_name);
332                 strbuf_setlen(dest, dest_len);
333                 strbuf_addstr(dest, de->d_name);
334                 if (stat(src->buf, &buf)) {
335                         warning (_("failed to stat %s\n"), src->buf);
336                         continue;
337                 }
338                 if (S_ISDIR(buf.st_mode)) {
339                         if (de->d_name[0] != '.')
340                                 copy_or_link_directory(src, dest,
341                                                        src_repo, src_baselen);
342                         continue;
343                 }
344
345                 /* Files that cannot be copied bit-for-bit... */
346                 if (!strcmp(src->buf + src_baselen, "/info/alternates")) {
347                         copy_alternates(src, dest, src_repo);
348                         continue;
349                 }
350
351                 if (unlink(dest->buf) && errno != ENOENT)
352                         die_errno(_("failed to unlink '%s'"), dest->buf);
353                 if (!option_no_hardlinks) {
354                         if (!link(src->buf, dest->buf))
355                                 continue;
356                         if (option_local)
357                                 die_errno(_("failed to create link '%s'"), dest->buf);
358                         option_no_hardlinks = 1;
359                 }
360                 if (copy_file_with_time(dest->buf, src->buf, 0666))
361                         die_errno(_("failed to copy file to '%s'"), dest->buf);
362         }
363         closedir(dir);
364 }
365
366 static void clone_local(const char *src_repo, const char *dest_repo)
367 {
368         if (option_shared) {
369                 struct strbuf alt = STRBUF_INIT;
370                 strbuf_addf(&alt, "%s/objects", src_repo);
371                 add_to_alternates_file(alt.buf);
372                 strbuf_release(&alt);
373         } else {
374                 struct strbuf src = STRBUF_INIT;
375                 struct strbuf dest = STRBUF_INIT;
376                 strbuf_addf(&src, "%s/objects", src_repo);
377                 strbuf_addf(&dest, "%s/objects", dest_repo);
378                 copy_or_link_directory(&src, &dest, src_repo, src.len);
379                 strbuf_release(&src);
380                 strbuf_release(&dest);
381         }
382
383         if (0 <= option_verbosity)
384                 printf(_("done.\n"));
385 }
386
387 static const char *junk_work_tree;
388 static const char *junk_git_dir;
389 static pid_t junk_pid;
390
391 static void remove_junk(void)
392 {
393         struct strbuf sb = STRBUF_INIT;
394         if (getpid() != junk_pid)
395                 return;
396         if (junk_git_dir) {
397                 strbuf_addstr(&sb, junk_git_dir);
398                 remove_dir_recursively(&sb, 0);
399                 strbuf_reset(&sb);
400         }
401         if (junk_work_tree) {
402                 strbuf_addstr(&sb, junk_work_tree);
403                 remove_dir_recursively(&sb, 0);
404                 strbuf_reset(&sb);
405         }
406 }
407
408 static void remove_junk_on_signal(int signo)
409 {
410         remove_junk();
411         sigchain_pop(signo);
412         raise(signo);
413 }
414
415 static struct ref *find_remote_branch(const struct ref *refs, const char *branch)
416 {
417         struct ref *ref;
418         struct strbuf head = STRBUF_INIT;
419         strbuf_addstr(&head, "refs/heads/");
420         strbuf_addstr(&head, branch);
421         ref = find_ref_by_name(refs, head.buf);
422         strbuf_release(&head);
423
424         if (ref)
425                 return ref;
426
427         strbuf_addstr(&head, "refs/tags/");
428         strbuf_addstr(&head, branch);
429         ref = find_ref_by_name(refs, head.buf);
430         strbuf_release(&head);
431
432         return ref;
433 }
434
435 static struct ref *wanted_peer_refs(const struct ref *refs,
436                 struct refspec *refspec)
437 {
438         struct ref *head = copy_ref(find_ref_by_name(refs, "HEAD"));
439         struct ref *local_refs = head;
440         struct ref **tail = head ? &head->next : &local_refs;
441
442         if (option_single_branch) {
443                 struct ref *remote_head = NULL;
444
445                 if (!option_branch)
446                         remote_head = guess_remote_head(head, refs, 0);
447                 else
448                         remote_head = find_remote_branch(refs, option_branch);
449
450                 if (!remote_head && option_branch)
451                         warning(_("Could not find remote branch %s to clone."),
452                                 option_branch);
453                 else {
454                         get_fetch_map(remote_head, refspec, &tail, 0);
455
456                         /* if --branch=tag, pull the requested tag explicitly */
457                         get_fetch_map(remote_head, tag_refspec, &tail, 0);
458                 }
459         } else
460                 get_fetch_map(refs, refspec, &tail, 0);
461
462         if (!option_mirror && !option_single_branch)
463                 get_fetch_map(refs, tag_refspec, &tail, 0);
464
465         return local_refs;
466 }
467
468 static void write_remote_refs(const struct ref *local_refs)
469 {
470         const struct ref *r;
471
472         for (r = local_refs; r; r = r->next) {
473                 if (!r->peer_ref)
474                         continue;
475                 add_extra_ref(r->peer_ref->name, r->old_sha1, 0);
476         }
477
478         pack_refs(PACK_REFS_ALL);
479         clear_extra_refs();
480 }
481
482 static void write_followtags(const struct ref *refs, const char *msg)
483 {
484         const struct ref *ref;
485         for (ref = refs; ref; ref = ref->next) {
486                 if (prefixcmp(ref->name, "refs/tags/"))
487                         continue;
488                 if (!suffixcmp(ref->name, "^{}"))
489                         continue;
490                 if (!has_sha1_file(ref->old_sha1))
491                         continue;
492                 update_ref(msg, ref->name, ref->old_sha1,
493                            NULL, 0, DIE_ON_ERR);
494         }
495 }
496
497 static void update_remote_refs(const struct ref *refs,
498                                const struct ref *mapped_refs,
499                                const struct ref *remote_head_points_at,
500                                const char *branch_top,
501                                const char *msg)
502 {
503         if (refs) {
504                 clear_extra_refs();
505                 write_remote_refs(mapped_refs);
506                 if (option_single_branch)
507                         write_followtags(refs, msg);
508         }
509
510         if (remote_head_points_at && !option_bare) {
511                 struct strbuf head_ref = STRBUF_INIT;
512                 strbuf_addstr(&head_ref, branch_top);
513                 strbuf_addstr(&head_ref, "HEAD");
514                 create_symref(head_ref.buf,
515                               remote_head_points_at->peer_ref->name,
516                               msg);
517         }
518 }
519
520 static void update_head(const struct ref *our, const struct ref *remote,
521                         const char *msg)
522 {
523         if (our && !prefixcmp(our->name, "refs/heads/")) {
524                 /* Local default branch link */
525                 create_symref("HEAD", our->name, NULL);
526                 if (!option_bare) {
527                         const char *head = skip_prefix(our->name, "refs/heads/");
528                         update_ref(msg, "HEAD", our->old_sha1, NULL, 0, DIE_ON_ERR);
529                         install_branch_config(0, head, option_origin, our->name);
530                 }
531         } else if (our) {
532                 struct commit *c = lookup_commit_reference(our->old_sha1);
533                 /* --branch specifies a non-branch (i.e. tags), detach HEAD */
534                 update_ref(msg, "HEAD", c->object.sha1,
535                            NULL, REF_NODEREF, DIE_ON_ERR);
536         } else if (remote) {
537                 /*
538                  * We know remote HEAD points to a non-branch, or
539                  * HEAD points to a branch but we don't know which one.
540                  * Detach HEAD in all these cases.
541                  */
542                 update_ref(msg, "HEAD", remote->old_sha1,
543                            NULL, REF_NODEREF, DIE_ON_ERR);
544         }
545 }
546
547 static int checkout(void)
548 {
549         unsigned char sha1[20];
550         char *head;
551         struct lock_file *lock_file;
552         struct unpack_trees_options opts;
553         struct tree *tree;
554         struct tree_desc t;
555         int err = 0, fd;
556
557         if (option_no_checkout)
558                 return 0;
559
560         head = resolve_refdup("HEAD", sha1, 1, NULL);
561         if (!head) {
562                 warning(_("remote HEAD refers to nonexistent ref, "
563                           "unable to checkout.\n"));
564                 return 0;
565         }
566         if (!strcmp(head, "HEAD")) {
567                 if (advice_detached_head)
568                         detach_advice(sha1_to_hex(sha1));
569         } else {
570                 if (prefixcmp(head, "refs/heads/"))
571                         die(_("HEAD not found below refs/heads!"));
572         }
573         free(head);
574
575         /* We need to be in the new work tree for the checkout */
576         setup_work_tree();
577
578         lock_file = xcalloc(1, sizeof(struct lock_file));
579         fd = hold_locked_index(lock_file, 1);
580
581         memset(&opts, 0, sizeof opts);
582         opts.update = 1;
583         opts.merge = 1;
584         opts.fn = oneway_merge;
585         opts.verbose_update = (option_verbosity > 0);
586         opts.src_index = &the_index;
587         opts.dst_index = &the_index;
588
589         tree = parse_tree_indirect(sha1);
590         parse_tree(tree);
591         init_tree_desc(&t, tree->buffer, tree->size);
592         unpack_trees(1, &t, &opts);
593
594         if (write_cache(fd, active_cache, active_nr) ||
595             commit_locked_index(lock_file))
596                 die(_("unable to write new index file"));
597
598         err |= run_hook(NULL, "post-checkout", sha1_to_hex(null_sha1),
599                         sha1_to_hex(sha1), "1", NULL);
600
601         if (!err && option_recursive)
602                 err = run_command_v_opt(argv_submodule, RUN_GIT_CMD);
603
604         return err;
605 }
606
607 static int write_one_config(const char *key, const char *value, void *data)
608 {
609         return git_config_set_multivar(key, value ? value : "true", "^$", 0);
610 }
611
612 static void write_config(struct string_list *config)
613 {
614         int i;
615
616         for (i = 0; i < config->nr; i++) {
617                 if (git_config_parse_parameter(config->items[i].string,
618                                                write_one_config, NULL) < 0)
619                         die("unable to write parameters to config file");
620         }
621 }
622
623 int cmd_clone(int argc, const char **argv, const char *prefix)
624 {
625         int is_bundle = 0, is_local;
626         struct stat buf;
627         const char *repo_name, *repo, *work_tree, *git_dir;
628         char *path, *dir;
629         int dest_exists;
630         const struct ref *refs, *remote_head;
631         const struct ref *remote_head_points_at;
632         const struct ref *our_head_points_at;
633         struct ref *mapped_refs;
634         const struct ref *ref;
635         struct strbuf key = STRBUF_INIT, value = STRBUF_INIT;
636         struct strbuf branch_top = STRBUF_INIT, reflog_msg = STRBUF_INIT;
637         struct transport *transport = NULL;
638         const char *src_ref_prefix = "refs/heads/";
639         struct remote *remote;
640         int err = 0, complete_refs_before_fetch = 1;
641
642         struct refspec *refspec;
643         const char *fetch_pattern;
644
645         junk_pid = getpid();
646
647         packet_trace_identity("clone");
648         argc = parse_options(argc, argv, prefix, builtin_clone_options,
649                              builtin_clone_usage, 0);
650
651         if (argc > 2)
652                 usage_msg_opt(_("Too many arguments."),
653                         builtin_clone_usage, builtin_clone_options);
654
655         if (argc == 0)
656                 usage_msg_opt(_("You must specify a repository to clone."),
657                         builtin_clone_usage, builtin_clone_options);
658
659         if (option_single_branch == -1)
660                 option_single_branch = option_depth ? 1 : 0;
661
662         if (option_mirror)
663                 option_bare = 1;
664
665         if (option_bare) {
666                 if (option_origin)
667                         die(_("--bare and --origin %s options are incompatible."),
668                             option_origin);
669                 option_no_checkout = 1;
670         }
671
672         if (!option_origin)
673                 option_origin = "origin";
674
675         repo_name = argv[0];
676
677         path = get_repo_path(repo_name, &is_bundle);
678         if (path)
679                 repo = xstrdup(absolute_path(repo_name));
680         else if (!strchr(repo_name, ':'))
681                 die(_("repository '%s' does not exist"), repo_name);
682         else
683                 repo = repo_name;
684         is_local = path && !is_bundle;
685         if (is_local && option_depth)
686                 warning(_("--depth is ignored in local clones; use file:// instead."));
687
688         if (argc == 2)
689                 dir = xstrdup(argv[1]);
690         else
691                 dir = guess_dir_name(repo_name, is_bundle, option_bare);
692         strip_trailing_slashes(dir);
693
694         dest_exists = !stat(dir, &buf);
695         if (dest_exists && !is_empty_dir(dir))
696                 die(_("destination path '%s' already exists and is not "
697                         "an empty directory."), dir);
698
699         strbuf_addf(&reflog_msg, "clone: from %s", repo);
700
701         if (option_bare)
702                 work_tree = NULL;
703         else {
704                 work_tree = getenv("GIT_WORK_TREE");
705                 if (work_tree && !stat(work_tree, &buf))
706                         die(_("working tree '%s' already exists."), work_tree);
707         }
708
709         if (option_bare || work_tree)
710                 git_dir = xstrdup(dir);
711         else {
712                 work_tree = dir;
713                 git_dir = xstrdup(mkpath("%s/.git", dir));
714         }
715
716         if (!option_bare) {
717                 junk_work_tree = work_tree;
718                 if (safe_create_leading_directories_const(work_tree) < 0)
719                         die_errno(_("could not create leading directories of '%s'"),
720                                   work_tree);
721                 if (!dest_exists && mkdir(work_tree, 0755))
722                         die_errno(_("could not create work tree dir '%s'."),
723                                   work_tree);
724                 set_git_work_tree(work_tree);
725         }
726         junk_git_dir = git_dir;
727         atexit(remove_junk);
728         sigchain_push_common(remove_junk_on_signal);
729
730         setenv(CONFIG_ENVIRONMENT, mkpath("%s/config", git_dir), 1);
731
732         if (safe_create_leading_directories_const(git_dir) < 0)
733                 die(_("could not create leading directories of '%s'"), git_dir);
734
735         set_git_dir_init(git_dir, real_git_dir, 0);
736         if (real_git_dir)
737                 git_dir = real_git_dir;
738
739         if (0 <= option_verbosity) {
740                 if (option_bare)
741                         printf(_("Cloning into bare repository '%s'...\n"), dir);
742                 else
743                         printf(_("Cloning into '%s'...\n"), dir);
744         }
745         init_db(option_template, INIT_DB_QUIET);
746         write_config(&option_config);
747
748         /*
749          * At this point, the config exists, so we do not need the
750          * environment variable.  We actually need to unset it, too, to
751          * re-enable parsing of the global configs.
752          */
753         unsetenv(CONFIG_ENVIRONMENT);
754
755         git_config(git_default_config, NULL);
756
757         if (option_bare) {
758                 if (option_mirror)
759                         src_ref_prefix = "refs/";
760                 strbuf_addstr(&branch_top, src_ref_prefix);
761
762                 git_config_set("core.bare", "true");
763         } else {
764                 strbuf_addf(&branch_top, "refs/remotes/%s/", option_origin);
765         }
766
767         strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
768
769         if (option_mirror || !option_bare) {
770                 /* Configure the remote */
771                 strbuf_addf(&key, "remote.%s.fetch", option_origin);
772                 git_config_set_multivar(key.buf, value.buf, "^$", 0);
773                 strbuf_reset(&key);
774
775                 if (option_mirror) {
776                         strbuf_addf(&key, "remote.%s.mirror", option_origin);
777                         git_config_set(key.buf, "true");
778                         strbuf_reset(&key);
779                 }
780         }
781
782         strbuf_addf(&key, "remote.%s.url", option_origin);
783         git_config_set(key.buf, repo);
784         strbuf_reset(&key);
785
786         if (option_reference.nr)
787                 setup_reference();
788
789         fetch_pattern = value.buf;
790         refspec = parse_fetch_refspec(1, &fetch_pattern);
791
792         strbuf_reset(&value);
793
794         remote = remote_get(option_origin);
795         transport = transport_get(remote, remote->url[0]);
796
797         if (!is_local) {
798                 if (!transport->get_refs_list || !transport->fetch)
799                         die(_("Don't know how to clone %s"), transport->url);
800
801                 transport_set_option(transport, TRANS_OPT_KEEP, "yes");
802
803                 if (option_depth)
804                         transport_set_option(transport, TRANS_OPT_DEPTH,
805                                              option_depth);
806                 if (option_single_branch)
807                         transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
808
809                 transport_set_verbosity(transport, option_verbosity, option_progress);
810
811                 if (option_upload_pack)
812                         transport_set_option(transport, TRANS_OPT_UPLOADPACK,
813                                              option_upload_pack);
814         }
815
816         refs = transport_get_remote_refs(transport);
817         mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
818
819         /*
820          * transport_get_remote_refs() may return refs with null sha-1
821          * in mapped_refs (see struct transport->get_refs_list
822          * comment). In that case we need fetch it early because
823          * remote_head code below relies on it.
824          *
825          * for normal clones, transport_get_remote_refs() should
826          * return reliable ref set, we can delay cloning until after
827          * remote HEAD check.
828          */
829         for (ref = refs; ref; ref = ref->next)
830                 if (is_null_sha1(ref->old_sha1)) {
831                         complete_refs_before_fetch = 0;
832                         break;
833                 }
834
835         if (!is_local && !complete_refs_before_fetch && refs)
836                 transport_fetch_refs(transport, mapped_refs);
837
838         if (refs) {
839                 remote_head = find_ref_by_name(refs, "HEAD");
840                 remote_head_points_at =
841                         guess_remote_head(remote_head, mapped_refs, 0);
842
843                 if (option_branch) {
844                         our_head_points_at =
845                                 find_remote_branch(mapped_refs, option_branch);
846
847                         if (!our_head_points_at)
848                                 die(_("Remote branch %s not found in upstream %s"),
849                                     option_branch, option_origin);
850                 }
851                 else
852                         our_head_points_at = remote_head_points_at;
853         }
854         else {
855                 warning(_("You appear to have cloned an empty repository."));
856                 our_head_points_at = NULL;
857                 remote_head_points_at = NULL;
858                 remote_head = NULL;
859                 option_no_checkout = 1;
860                 if (!option_bare)
861                         install_branch_config(0, "master", option_origin,
862                                               "refs/heads/master");
863         }
864
865         if (is_local)
866                 clone_local(path, git_dir);
867         else if (refs && complete_refs_before_fetch)
868                 transport_fetch_refs(transport, mapped_refs);
869
870         update_remote_refs(refs, mapped_refs, remote_head_points_at,
871                            branch_top.buf, reflog_msg.buf);
872
873         update_head(our_head_points_at, remote_head, reflog_msg.buf);
874
875         transport_unlock_pack(transport);
876         transport_disconnect(transport);
877
878         err = checkout();
879
880         strbuf_release(&reflog_msg);
881         strbuf_release(&branch_top);
882         strbuf_release(&key);
883         strbuf_release(&value);
884         junk_pid = 0;
885         return err;
886 }